<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2010 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.2, 2010-01-11
 */


/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
    /**
     * @ignore
     */
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../');
}

/** PHPExcel */
require_once PHPEXCEL_ROOT . 'PHPExcel.php';

/** PHPExcel_IWriter */
require_once PHPEXCEL_ROOT . 'PHPExcel/Writer/IWriter.php';

/** PHPExcel_IReader */
require_once PHPEXCEL_ROOT . 'PHPExcel/Reader/IReader.php';


/**
 * PHPExcel_IOFactory
 *
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_IOFactory
{
    /**
     * Search locations
     *
     * @var array
     */
    private static $_searchLocations = array(
        array('type' => 'IWriter', 'path' => 'PHPExcel/Writer/{0}.php', 'class' => 'PHPExcel_Writer_{0}'),
        array('type' => 'IReader', 'path' => 'PHPExcel/Reader/{0}.php', 'class' => 'PHPExcel_Reader_{0}')
    );

    /**
     * Autoresolve classes
     *
     * @var array
     */
    private static $_autoResolveClasses = array(
        'Excel2007',
        'Excel5',
        'Excel2003XML',
        'OOCalc',
        'SYLK',
        'Serialized',
        'CSV',
    );

    /**
     * Private constructor for PHPExcel_IOFactory
     */
    private function __construct()
    {
    }

    /**
     * Get search locations
     *
     * @return array
     */
    public static function getSearchLocations()
    {
        return self::$_searchLocations;
    }

    /**
     * Set search locations
     *
     * @param array $value
     * @throws Exception
     */
    public static function setSearchLocations($value)
    {
        if (is_array($value)) {
            self::$_searchLocations = $value;
        } else {
            throw new Exception('Invalid parameter passed.');
        }
    }

    /**
     * Add search location
     *
     * @param string $type Example: IWriter
     * @param string $location Example: PHPExcel/Writer/{0}.php
     * @param string $classname Example: PHPExcel_Writer_{0}
     */
    public static function addSearchLocation($type = '', $location = '', $classname = '')
    {
        self::$_searchLocations[] = array('type' => $type, 'path' => $location, 'class' => $classname);
    }

    /**
     * Create PHPExcel_Writer_IWriter
     *
     * @param PHPExcel $phpExcel
     * @param string $writerType Example: Excel2007
     * @return PHPExcel_Writer_IWriter
     */
    public static function createWriter(PHPExcel $phpExcel, $writerType = '')
    {
        // Search type
        $searchType = 'IWriter';

        // Include class
        foreach (self::$_searchLocations as $searchLocation) {
            if ($searchLocation['type'] == $searchType) {
                $className = str_replace('{0}', $writerType, $searchLocation['class']);
                $classFile = str_replace('{0}', $writerType, $searchLocation['path']);

                if (!class_exists($className)) {
                    require_once PHPEXCEL_ROOT . $classFile;
                }

                $instance = new $className($phpExcel);
                if (!is_null($instance)) {
                    return $instance;
                }
            }
        }

        // Nothing found...
        throw new Exception("No $searchType found for type $writerType");
    }

    /**
     * Create PHPExcel_Reader_IReader
     *
     * @param string $readerType Example: Excel2007
     * @return PHPExcel_Reader_IReader
     */
    public static function createReader($readerType = '')
    {
        // Search type
        $searchType = 'IReader';

        // Include class
        foreach (self::$_searchLocations as $searchLocation) {
            if ($searchLocation['type'] == $searchType) {
                $className = str_replace('{0}', $readerType, $searchLocation['class']);
                $classFile = str_replace('{0}', $readerType, $searchLocation['path']);

                if (!class_exists($className)) {
                    require_once PHPEXCEL_ROOT . $classFile;
                }

                $instance = new $className();
                if (!is_null($instance)) {
                    return $instance;
                }
            }
        }

        // Nothing found...
        throw new Exception("No $searchType found for type $readerType");
    }

    /**
     * Loads PHPExcel from file using automatic PHPExcel_Reader_IReader resolution
     *
     * @param    string $pFileName
     * @return    PHPExcel
     */
    public static function load($pFilename)
    {
        $reader = self::createReaderForFile($pFilename);
        return $reader->load($pFilename);
    }

    /**
     * Create PHPExcel_Reader_IReader for file using automatic PHPExcel_Reader_IReader resolution
     *
     * @param    string $pFileName
     * @return    PHPExcel_Reader_IReader
     */
    public static function createReaderForFile($pFilename)
    {

        // First, lucky guess by inspecting file extension
        $pathinfo = pathinfo($pFilename);

        if (isset($pathinfo['extension'])) {

            switch (strtolower($pathinfo['extension'])) {
                case 'xlsx':
                    $reader = self::createReader('Excel2007');
                    break;

                case 'xls':
                    $reader = self::createReader('Excel5');
                    break;

                case 'ods':
                    $reader = self::createReader('OOCalc');
                    break;

                case 'slk':
                    $reader = self::createReader('SYLK');
                    break;

                case 'xml':
                    $reader = self::createReader('Excel2003XML');
                    break;

                case 'csv':
                    // Do nothing
                    // We must not try to use CSV reader since it loads
                    // all files including Excel files etc.
                    break;

                default:
                    break;

            }

            // Let's see if we are lucky
            if ($reader->canRead($pFilename)) {
                return $reader;
            }

        }

        // If we reach here then "lucky guess" didn't give any result

        // Try loading using self::$_autoResolveClasses
        foreach (self::$_autoResolveClasses as $autoResolveClass) {
            $reader = self::createReader($autoResolveClass);
            if ($reader->canRead($pFilename)) {
                return $reader;
            }
        }

    }
}
